| http://www.w3.org/ns/prov#value | - Also, when hexahydric alcohols, such as sorbitol, mannitol, galactitol, iditol, talitol, and allitol, are used, cyclic ketals or cyclic acetals represented by formulas (IIIa) and (IIIb) are obtained, of which those represented by formula (IIIa) having three 1,3-dioxolan structures are preferred because high insulating property is obtained.
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